Unit sizing and model selection
We measure flow rate and incoming water temperature, then recommend a specific model. You get the exact model number in writing before we order anything.
Licensed
Licensed & Bonded
Fully Insured
Insured & Bonded
24/7 Emergency
Same-Day Response
Warranty Backed
Workmanship Guaranteed in Dallas
What is included in a tankless install
Every install we quote includes the labor, materials, and permits needed to get your unit running to code. Here is what is covered and what we handle as an add-on if your home needs it.
Gas line upgrade if needed
Most Dallas homes need a three-quarter-inch gas run to feed a tankless burner. We run copper pipe or PEX tubing from the meter and pressure-test every joint.
Stainless steel venting
We run manufacturer-approved stainless steel or PVC venting to an exterior wall, with correct clearances and condensate management. Venting is inspected to code.
Isolation valves and filter
Isolation valves let us flush the unit without shutting off your whole house. A water filter on the cold inlet keeps sediment out of the heat exchanger.
Permit and inspection
We pull the plumbing permit from Dallas County, schedule the inspection, and correct anything the inspector flags at no extra charge.
Commissioning and walkthrough
We fire the burner, verify gas pressure and CO levels with a combustion analyzer, set the outlet temperature, and walk you through the controls.
What gas tankless water heater installation Dallas TX really involves
Gas tankless water heater installation Dallas TX is the licensed trade of replacing or adding a tankless unit that heats water on demand by firing a gas burner against a copper heat exchanger as water flows through it. It is not a swap-and-go job. We size the unit to your fixture count, upgrade the gas line to handle 150,000 to 199,000 BTU input, run stainless steel venting to the exterior, install isolation valves, and pressure-test every joint before we light the burner.
Dallas homes need this work for specific reasons. Attic-mounted tank units fail in our 100-plus-degree summers, and older slab homes in East Dallas and Oak Lawn often have undersized half-inch gas runs that starve a tankless burner. If you have been searching for gas tankless water heater installation Dallas TX near me after a tank leak, we can usually assess and quote the same day. We also handle gas tankless water heater replacement Dallas TX when an existing unit has hit end of life.
Our gas tankless installation process, step by step
Every install follows the same sequence. You know what happens, who is in your home, and how long each stage takes before we start.
01
Schedule
Call or book online — a real human picks up and confirms a 2-hour arrival window.
02
Diagnose
Licensed tech inspects on-site, then walks you through the cause and your options.
03
Fix
The job is completed to code and done right the first time — no shortcuts, no surprises.
04
Guarantee
Every job backed by a written workmanship warranty — and we stand behind it.
Tools and methods we use on every install
Tools & Equipment
Manifold pressure gauge
Confirms the burner sees the correct inches of water column at full fire. We do not light a unit until this reading is in spec.
Combustion analyzer
Verifies CO and CO2 levels in the exhaust are within manufacturer spec. This is a safety check, not an optional step.
Descaling pump and flush kit
Used for annual maintenance to clear scale from the heat exchanger. We install isolation valves so future flushes take under an hour.
Pipe wrench and tube brush
Standard tools for gas and water connections, plus cleaning burner ports and inlet screens during commissioning.
Thermal camera
Locates hot spots and hidden leaks in the venting and water lines after install. Catches problems before they show up as a callback.
Water flow meter
Measures actual flow rate at the fixtures so we size the unit correctly instead of guessing from square footage.
Pressure gauge
Pressure-tests the gas and water lines after connection. Every joint is verified before we leave the property.
Methods & Standards
Uniform Plumbing Code and International Plumbing Code compliance
Every install is built to UPC and IPC standards for gas sizing, venting clearances, and pressure relief. Dallas County inspectors sign off on the work, and we correct anything they flag at no charge.
Manufacturer-specific commissioning
Rinnai, Navien, Noritz, and Rheem each have their own startup sequence and dip-switch settings. We follow the manufacturer's commissioning checklist so the warranty stays valid and the unit runs at rated efficiency.
Pressure and combustion testing
We pressure-test every gas and water joint, then run a combustion analyzer on the exhaust. If any reading is out of spec, we correct it before we call the job complete.
Isolation valve and filter install
Isolation valves and a cold-inlet water filter go in on every install. They make future maintenance fast and protect the heat exchanger from Dallas water hardness.
When Dallas homeowners call us for tankless
01
A family of five in North Dallas keeps running out of hot water with a 50-gallon tank.
What we do: We size and install a 199,000 BTU Rinnai unit with a three-quarter-inch gas line and stainless steel venting. The install takes one day.
→ Endless hot water for every shower, plus about 25 percent lower water-heating gas usage on the next bill.
02
A Lakewood bungalow has a tank in the attic that is 12 years old and showing rust.
What we do: We convert to a wall-mounted Navien unit in the garage, run new venting, and haul off the old tank. We also add isolation valves for future flushing.
→ No more tank in the attic, no more leak risk over the ceiling, and a unit rated for 18 to 20 years.
03
An Uptown condo owner wants tankless but has a tight utility closet and no exterior wall nearby.
What we do: We use a concentric venting kit that runs through the existing roof penetration and mount the unit on the closet wall.
→ Tankless hot water in a space where a tank would never fit, with venting that passes inspection.
04
A property manager in East Dallas needs four rental homes converted from tank to tankless.
What we do: We schedule the installs across two weeks, pull permits for each address, and register the manufacturer warranties.
→ Four code-correct installs, no callbacks, and lower gas usage for the tenants.
How tankless installation runs in Dallas specifically
Dallas has a few quirks that change how we approach every tankless install. Our water is hard, averaging 8 to 10 grains per gallon, which means scale buildup is the number one killer of heat exchangers here. We install a water filter and isolation valves on every job so annual descaling is quick. Our summers push attic temperatures past 140 degrees, so we avoid attic installs when possible and prefer garage or exterior wall mounting. Older slab homes in East Dallas and Oak Lawn often have half-inch gas runs that cannot feed a 199,000 BTU burner, so a gas line upgrade is part of most quotes. Winter freezes are rare but real, and a single hard freeze can crack an unprotected heat exchanger overnight. We install freeze protection kits and set the unit to cycle during cold snaps. If you are looking for gas tankless water heater installation in North Dallas or anywhere in Dallas County, we know the local code requirements and the common failure points.
Neighborhoods We Serve
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Lakewood
Many 1920s and 1930s bungalows here have original half-inch gas runs. Most tankless installs in Lakewood include a gas line upgrade.
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Uptown Dallas
High-rise condos often have tight utility closets and shared venting chases. We use concentric venting kits and wall-mount units to fit the space.
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North Dallas
Newer construction usually has three-quarter-inch gas already in place, so installs here are faster and less expensive on average.
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Oak Lawn
Older homes with slab foundations and attic-mounted tanks. We typically relocate the unit to a garage or exterior wall during conversion.
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Deep Ellum
Mixed-use buildings and converted lofts need careful venting planning to avoid nuisance complaints from neighboring units.
Local Conditions We Plan For
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Hard water averaging 8 to 10 grains per gallon
Scale builds up on the heat exchanger faster than in most US cities. We install a filter and isolation valves on every job and recommend annual descaling.
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Summer attic temperatures above 140 degrees
Attic-mounted tankless units run hotter and fail sooner. We relocate to a garage or exterior wall whenever the layout allows.
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Older homes with half-inch gas service
A half-inch line cannot feed a 199,000 BTU burner under full fire. Most Dallas installs include a gas line upgrade to three-quarter-inch.
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Occasional hard freezes in winter
An unprotected heat exchanger can crack overnight. We install freeze protection kits and set the unit to cycle during cold snaps.
Lakewood bungalow tank-to-tankless conversion
Problems we solve with gas tankless installation in Dallas
Most tankless calls start with one of these issues. Here is what we see and how we fix it.
Problem
Running out of hot water with a full house
The third shower in the morning goes cold, and everyone is late. A tank that cannot keep up is the usual cause.
Our Fix
We size a tankless unit to your actual fixture count and incoming water temperature. A 199,000 BTU unit handles two showers plus a dishwasher at once, so the cold-shower problem disappears the day we commission it.
Problem
Old tank leaking in the attic or closet
Water damage to drywall, insulation, and flooring can run into thousands of dollars if the leak is not caught fast.
Our Fix
We drain and remove the failed tank, inspect for water damage, and install a wall-mounted tankless unit in the same location or a better one. Most conversions are done in a single day.
Problem
Undersized gas line starving the burner
The unit fires, then shuts off with an ignition failure or flame failure code. It never delivers consistent hot water.
Our Fix
We measure your meter capacity and run a correctly sized three-quarter-inch gas line. A manifold pressure gauge confirms the burner sees the right inches of water column before we call the job done.
Problem
Scale buildup killing the heat exchanger
Dallas water is hard enough that untreated tankless units lose efficiency fast and can fail in under five years.
Our Fix
We install a water filter and isolation valves at day one, and we can tie in a water softener if you have one. Annual descaling with a flush kit keeps the exchanger clean and the warranty valid.
Problem
Freeze damage during a North Texas cold snap
A cracked heat exchanger means a full replacement, not a repair. It usually happens overnight during a hard freeze.
Our Fix
We install freeze protection kits and set the unit to cycle during cold snaps. For outdoor or garage-mounted units, we add insulation and a recirculation setup that keeps water moving.
Why Dallas homeowners switch to tankless
Tankless units change how your home makes hot water. Here is what you actually get when the install is done right.
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Endless hot water supply
A properly sized tankless unit delivers continuous hot water at 120 to 140 degrees for as long as you run the tap. No more cold showers when the third person in line hits the bathroom. For a family of four in North Dallas, that alone justifies the switch.
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Lower monthly gas bills
Tankless units only fire when there is demand, so you stop paying to keep 40 or 50 gallons hot around the clock. Most Dallas households see 20 to 30 percent lower water-heating gas usage after gas tankless water heater setup Dallas wide is completed and the old tank is hauled off.
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Reclaims closet and attic space
A wall-mounted Rinnai or Navien takes up roughly the footprint of a carry-on suitcase. That frees up the closet, garage corner, or attic platform your old tank occupied. In tight Uptown and Deep Ellum layouts, that recovered square footage matters more than the unit itself.
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Longer service life
Tankless heat exchangers commonly run 18 to 20 years with annual descaling, versus 8 to 12 for a tank. We install isolation valves and a water filter at day one so future flushing is a 45-minute job instead of a teardown.
Licensed, insured, and code-correct
Licensed & Certified
- Texas State Board of Plumbing Examiners (TSBPE) license — issued by Texas State Board of Plumbing Examiners
- NATE certification — issued by North American Technician Excellence
- EPA Section 608 certification — issued by US Environmental Protection Agency
- OSHA safety certification — issued by Occupational Safety and Health Administration
- Manufacturer-specific training (Rinnai, Navien) — issued by Rinnai America and Navien Inc.
Verified Reviews
Google ★★★★★4.9
Quoted a Rinnai install on Monday, installed it Wednesday. They ran a new gas line and vented through the side wall. Everything passed inspection first try. Hot water is instant and the gas bill dropped.
Yelp ★★★★★4.8
Our tank started leaking on a Saturday. These guys came out the same day, confirmed the tank was done, and had a Navien installed by Tuesday. Clean work, fair price, no upsell.
BBB ★★★★★4.9
We manage rentals and have used them for four tankless conversions. Permits pulled, inspections passed, warranties registered. Zero callbacks. That is why we keep calling.
Google ★★★★★5.0
The tech explained the freeze protection settings and walked me through the annual flush. He also pointed out our water softener was not tied into the cold inlet. Fixed it on the spot.
Licensed tankless expertise you can verify
Our plumbers hold Texas State Board of Plumbing Examiners licenses and carry manufacturer-specific training on Rinnai, Navien, Noritz, and Rheem platforms. We install to Uniform Plumbing Code and International Plumbing Code standards, and every gas connection is pressure-tested and documented. Because we work on tankless units daily, we know which models handle Dallas water hardness and which venting configurations pass inspection the first time. That local experience shows up in fewer callbacks and cleaner installs.
- TSBPE-licensed plumbers on every job, no subcontractors
- Manufacturer-specific training on Rinnai, Navien, and Noritz platforms
- EPA Section 608 and OSHA safety certification held by field techs
- Combustion analyzer and manifold pressure gauge used on every commissioning
- Installs permitted and inspected to Dallas County code requirements
Frequently Asked Questions
Real answers to the questions we hear most often from local homeowners and property managers.
How much does gas tankless water heater installation cost in Dallas TX?
Most residential installs run $2,800 to $5,500 in 2026, including the unit, gas line upgrade, venting, and permit. A straight replacement of an existing tankless unit runs $1,200 to $2,200. Cost climbs if you need a longer vent run, a larger gas meter, or a recirculation pump added.
Do I need a plumber for a gas tankless water heater in Dallas?
Yes. Texas law requires a licensed plumber for gas line work and potable water connections, and Dallas County inspects the install. A handyman cannot legally pull the permit or sign off on the gas connection. We handle the permit, the inspection, and the warranty registration for you.
What size gas line do I need for a tankless water heater in Dallas?
Most 199,000 BTU tankless units need a three-quarter-inch gas line with at least 6 inches of water column at the inlet under full fire. Many older Dallas homes have half-inch runs that starve the burner and trigger ignition failure. We measure your meter capacity and run the correct size the first time.
Are gas tankless water heaters worth it in Dallas?
For most Dallas households, yes. You get endless hot water, 20 to 30 percent lower water-heating gas use, and a unit that lasts 18 to 20 years with annual descaling. The break-even on the higher upfront cost usually lands in five to seven years depending on family size and usage.
Related Services
Tankless Water Heater Installation
Our core tankless install service covers gas and electric units, sizing, venting, and permitting. If you are still deciding between gas and electric, we walk you through the trade-offs before you commit.
View Tankless Water Heater InstallationTankless Water Heater Repair
When your unit throws an error code or stops firing, we diagnose and repair on the spot. Common fixes include ignition failure, flame failure, and leaking water connections on units we did not install.
View Tankless Water Heater RepairTankless Water Heater Maintenance
Annual maintenance keeps your new install under warranty and running at full efficiency. We inspect the burner, clean the inlet filter, and check gas pressure once a year.
View Tankless Water Heater MaintenanceTankless Water Heater Replacement
When a tankless unit hits end of life, we swap it without touching the existing venting or gas line if they are still in spec. Most replacements are done in a single afternoon.
View Tankless Water Heater ReplacementTankless Water Heater Tune-Ups
A tune-up covers burner cleaning, filter rinse, and temperature calibration. Dallas water hardness makes annual tune-ups worth the cost for any tankless owner.
View Tankless Water Heater Tune-UpsTankless Water Heater Flushing & Descaling
Dallas water carries enough minerals that scale buildup is the number one cause of heat exchanger failure. We use a descaling pump and flush kit to clear it before damage sets in.
View Tankless Water Heater Flushing & DescalingContact Our Dallas Tankless Team
Call (214) 817-0188 any time, day or night, and we'll get a real person on the line. For non-emergency work, most Dallas jobs get a same-day or next-day appointment. You can also email info@waterheaterrepairs.com and we'll respond within one business day.
Water Heater Repairs
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Phone
(214) 817-0188 -
Address
14205 Proton Rd, Dallas, TX 75244, Dallas, Texas
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Hours
Mon–Fri: 7AM – 7PM
Sat: 8AM – 4PM
Sun: Emergency Only
24/7 Emergency Available